A3s/A4s is far more difficult than you can begin to fathom. DF's wouldn't even last 1-2 mins for those 2.
A3s requires coordination and a very good dps check to make. I can see holding well for 1st phase, but no way in hell for Phase 2/3, you stand no chance. Mainly statics look for people who are at the add phase or final phase, getting to that requires coordinated movement and a very good dps check.
A4s has an extreme DPS check that you must do or it wipes you in a mere instant. Merely controlling quarantines as the add inside gives blunt debuff stacks and hits like a tank on tanks if goes beyond 3. You have to defeat Phase 1/2 before getting a 4th quarantine or you're dead. Each leg clocks around 535k HP.
You won't really get much experience out of them unless you're super lucky. A3s only really starts at add phase, and A4s increases the dps check even higher on Phase 3/4.